iostat tablets

within 16 indicates that the machine runs very stable and smooth. If the load is more than 16, it indicates that the server is running a certain amount of pressure. Under the top command, press SHIFT + C to sort the process from large to small by CPU usage , pressing shift+ "P" to sort the process from large to small by memory usage , and it is easy to locate which services are consuming higher CPU and memory. Simply having the top command is not enough because it only shows CPU and memory usag

Linux system monitoring has the following commands: Uptime: Display system load condition Mpstat: Show CPU performance Free: Displaying memory usage Vmstat: Displaying virtual memory usage Iostat: Show System I/O activity Netstat: Displays the activity of the network DF/DU: Displaying disk usage 1. Uptime fdipzone@ubuntu:~$ uptime 00:06:00 up min, 2 users, load average:0.00, 0.03, 0.07 00:06:00 indicates the current time 32min indicat

of 225 processes are currently ) Line 3rd Cpu (s): 1.8%us, 0.9%sy, 0.0%ni, 97.1%id, 0.1%wa, 0.0%hi, 0.1%si, 0.0%st CPU Usage US: User process consumes CPU percentage SY: Kernel process consumes CPU percentage NI: process that has changed precedence consumes CPU percentage ID: Percentage of idle CPU Wa:io The waiting process consumes CPU percentage Hi: Percentage of hard interrupts consuming CPU Si: The percentage of CPU that the soft interrupt consumes St: Line 4th mem:32879852k Total, 2363304

permissionsWA--iowait amountoftimethecpuhasbeenwaitingfor I/O to complete.Find which disk is being writtenThe top command above explains I/O wait from a whole, but does not indicate which disk is affected, and to know which disk is causing the problem, we use another command Iostat command[[email protected] ~]# iostat-x 2 5Linux 3.10.0-514.el7.x86_64 (localhost.localdomain) March 03, 2017 _x86_64_

Shell Script View Linux system performance bottlenecks (go to: http://blog.51cto.com/lizhenliang/1687612)[[emailprotected] ~]# cat show_sys_info.sh #!/bin/bash#os_check () {if [-e/etc/redhat-release]; then redhat= ' cat/etc/redhat-release |cut-d '-f1 ' else debian= ' cat/etc/issue |cut-d '-F 1 ' fi if ["$REDHAT" = = "CentOS"-o "$REDHAT" = = "Red"]; Then P_m=yum elif ["$DEBIAN" = = "Ubuntu"-o "$DEBIAN" = = "Ubutnu"]; Then P_m=apt-get else Operating system does not support. Exit 1 f

, and the large WA value should consider balancing the disk load, can be combined with the Iostat output to analyze. 2.2: View disk load IostatThe disk IO information is counted every 2 seconds until you press CTRL + C to terminate the program, and the-D option represents the statistics disk information,-K is displayed in kilobytes per second, and-T requires time information to be printed, and 2 indicates output every 2 seconds. The disk IO load statu

During this fall's Ubuntu developer summit, the main questions discussed are: Where will Ubuntu be applied in the future. This topic was answered soon. In November 1, the founder of Ubuntu published a blog post saying that the company plans to push Ubuntu to tablets and smartphones. The message was sent and shocked the mobile world. Another player in the mobile industry has become increasingly competitive. Canonical plans to push Ubuntu to

cells are more readily processed from the adipose tissues, and the energy from the same is harnessed more quickly. apart from this, Clenbuterol has shown to reverse the effects of insulin, which facilitates the process of the breakdown of glycogen into glucose. clenbuterol also increases the fat burning rate in the body, or in other words speeds up the metabolism rate of the body. this feature is especially singled out, when Clenbuterol is administered exclusively as a weight loss drug.Random T

Installation Method When installing a software Yum-y install httpd When installing similar software Yum-y install httpd * When multiple non-similar software are installed Yum-y install httpd php-gd mysql When a software is uninstalled Yum-y remove httpd When multiple similar software are uninstalled Yum-y remove httpd * When multiple non-similar software are uninstalled Yum-y remove httpd php-gd mysql There is also a great usage If I want to execute the

Installing MEGACLI#cd/opt#rpm-IVH megacli-2.00.12-1.el5.x86_64.rpm#/opt/megaraid/megacli/megacli64-ldinfo-lall-aallLook, it's a 6-plate RAID5.650) this.width=650; "class=" Confluence-embedded-image "src=" http://wiki.tbox.me/download/attachments/10192235/ Clipboard.png?version=2modificationdate=1423560072000api=v2 "style=" margin:0px;padding:0px;border:0px ; "alt=" Clipboard.png?version=2modificationdate "/>View Disk Performance# iostat-d-x-k 1 10Disk

How Yum installs and uninstalls software in CentOSInstallation methodWhen installing a softwareYum-y Install httpdWhen installing multiple similar softwareYum-y Install httpd*When installing multiple non-similar softwareYum-y Install httpd php php-gd mysqlWhen uninstalling a softwareYum-y Remove httpdWhen uninstalling multiple similar softwareYum-y Remove httpd*When uninstalling multiple non-similar softwareYum-y Remove httpd php php-gd MySQLAnd there's a very good usage.If I want to execute

can use the CPU load analysis tool to monitor the load time. 17. Learn 5 Linux performance commands You can use several commands to manage the Linux system performance. The following lists the five most commonly used Linux performance commands, including top, vmstat, iostat, free, and sar, they help system administrators quickly solve performance problems. (1) top The Top command not only displays the tasks of the current kernel service, but also di

to increase the pressure. Next, we will take the opportunity of this performance test to introduce several useful commands. After starting, we can use the top command on the application server to observe its CPU utilization, press the number key 1, view the utilization of each CPU in detail. Ideally, we should be able to see a certain amount of pressure at this time.You can also use the vmstat command, for example, vmstat 1 30 mark, to print statistics every second for 30 seconds. The printed r

ArticleDirectory Iostat Meminfo and free Mpstat Netstat Nmon Pmap PS and pstree SAR Strace Tcpdump Top Uptime Vmstat Wireshark Original article link If you want to know what your server is doing, you need to know some basic commands. Once you are proficient in these commands, you are a professional Linux system administrator. Some Linux distributions provide the GUIProgramFor example, SuSE Lin

overall speed drop and solve it. The following are some basic skills to find out the key bottlenecks of the system: ● when a large application program, for example, when OpenOffice and Firefox run at the same time, the computer may start to slow down and the memory insufficiency may increase. ● If the startup is really slow, it may take a long loading time for the application to start for the first time. Once the application is started, it will run normally. Otherwise, it is likely that the har

0.00 0.00 0.00 0 running-daemon09:58:18 37268 0.00 0.00 0.00 0 fprintd09:58:18 37272 0.00 0.00 0.00 0 pidstatMonitor network I/O usage Nicstat was originally used to display network card traffic on the Solaris platform. Tim Cook transplanted it to the linux platform. First install it. The source code is here. The version used here is 1.92. Install the make environment: yum install gcc gcc-c++ make automake autoconf -y Because nicstat depends on 32 bit glibc package yum install libgcc.i686 glibc

How to install and uninstall software in Centos yumInstallation MethodWhen installing a softwareYum-y install httpdWhen installing similar softwareYum-y install httpd *When multiple non-similar software are installedYum-y install httpd php-gd mysqlWhen a software is uninstalledYum-y remove httpdWhen multiple similar software are uninstalledYum-y remove httpd *When multiple non-similar software are uninstalledYum-y remove httpd php-gd mysql also has a very good usage. If I want to execute the

disk tracking tool in Linux can use vmstat,The most important columns are bi and bo. They monitor the movement of input and output blocks with disk subsystems,It is important to have a baseline to mark changes;Iostat commandPerformance problems can be encountered when too program files are opened, read and writtenTo, then closed repeatedly. This cocould become apparent as seek times (the time it takesMove to the exact track where the data is stored)

example For Htop installation, read: Install Htop in Linux (Linux Process Monitoring) 7. Iotop-Linux disk monitoring I/O The Iotop command is also very similar to the top command and Htop program, but it has the function of monitoring and displaying real-time disk I/O and process statistics. This tool is useful when searching for specific processes and using a large number of disk read/write processes. # iotop For information about how to install and use Iotop, see install iotop in Linux. 8.

, the system seems to have more memory than the actual memory. The Linux system supports Virtual Memory, that is, the disk is used as the RAM Extension to expand the available memory. (1) monitors memory usage in real time in Linux systems. Generally, the free command is used to monitor memory usage. (2) Use the vmstat command to monitor the virtual memory usage, processes, and CPU activity of the system. # vmstat 3 3 4. Monitor CPU usage In Linux, top and mpstat tools are used to monitor CPU us